(CNN) — The number of Americans with diabetes continues to rise – there are now more than 29 million adults living with the disease, according to the latest data released by theCenters for Disease Control and Prevention on Tuesday. That’s 3 million more than the last time the CDC released diabetes statistics in 2011.

The CDC estimates that a quarter of these adults living with diabetes in the United States don’t even know they are sick, meaning they haven’t been diagnosed.

An additional 86 million American adults have what’s called “pre-diabetes,” which means that their blood sugar levels are higher than normal, but not yet on the level of diabetes. And nearly all – 90% – of these Americans do not know they are headed down a dangerous road. The CDC estimates that 15 to 30% of people with pre-diabetes will develop diabetes within five years if they don’t exercise and lose weight.

“These new numbers are alarming and underscore the need for an increased focus on reducing the burden of diabetes in our country,” Ann Albright, the CDC’s director of the division of diabetes translation, said in a press release. “It’s urgent that we take swift action to effectively treat and prevent this serious disease.”

People with diabetes are at increased risk for blindness, kidney failure, heart disease and stroke. The disease is usually linked to obesity, lack of physical activity and/or a family history of the disease.